Lockjaw Origin...

I thought the idea that Lockjaw was an inhuman child mutated into a dog was refuted.

"It was once believed that he was born humanoid and was changed by the Terrigen Mist, 'revealed' when he spoke to the Thing, but this was later described by Quicksilver to merely be a joke that Karnak and Gorgon were playing on the Thing."

According to the site you linked to, it seemed to indicate that it was PAD based on a suggestion from Busiek. It might have just been a way to invalidate Byrne's ideas. Since before his FF run, Lockjaw was a dog.